Tracking the Glucose Ketone Index


In this post we will examine the “glucose ketone index” as a biomarker for tracking metabolic health. We will also explore some of the primary use cases for tracking the glucose ketone index including cancer treatment, weight loss, metabolic disease management and athletic performance. Lastly, we will demonstrate how you can use Heads Up Health to track the glucose ketone index along with all of your other important health data.

If you want to skip ahead, click the button below to create an account with Heads Up and start tracking the glucose-ketone index alongside all of your other health metrics. Or, read on for more information on tracking the glucose ketone index.

Track your GKI!

What is the Glucose Ketone Index?

The glucose ketone index is simply a way to measure the relationship between your ketone levels and your glucose levels at any moment in time. It is measured by dividing your blood glucose level (mmol/L) by your blood ketone level (mmol/L). The result is a single number we can use an indicator of one’s metabolic state.

The index has its roots in brain cancer treatment, where researchers using metabolic therapy found best results when glucose and ketones maintained a very precise relationship in the patient [1]. Since there are many aspects of daily life (stress, exercise, nutrition etc.) that can upset glucose or ketone levels in the body, thereby throwing off the optimal glucose-ketone ratio, the index was developed to ensure both metrics (glucose and ketones) are maintaining the ideal ratio for optimal treatment outcomes.

Example: If my fasting blood sugar first thing in the morning is 4.6 mmol/L (82 mg/dL) and my ketone reading is 0.8 mmol/L, I would record a glucose ketone index of 5.75 (4.6 / 0.8).

Despite its roots in cancer treatment, the index can also be very helpful for those using metabolic therapy to treat (and prevent) diabetes, obesity, cancer (particularly cancers that express aerobic fermentation) and other metabolic conditions. By using an index that tracks glucose and ketones TOGETHER, we can develop zones that are optimal for addressing various health conditions.

The table below outlines some generally accepted zones of treatment using the glucose ketone index:

GKI value Degree of ketosis Degree of dysfunction
<1 Therapeutic ketosis Epilepsy
1-3 High ketosis Type 2 Diabetes
3-6 Moderate/functional
Insulin resistance
6-9 Low ketosis Optimal health
Weight loss
>9 No ketosis

Table 1: Optimal zones for the glucose ketone index [2]

Use cases for tracking the glucose ketone index

1. Cancer treatment
For those using metabolic therapy as a means to fight cancer (e.g. brain and other cancers that express aerobic fermentation), the index is an excellent way to ensure you are staying in the optimal zone [1].

2. Prevention

Maintaining a healthy glucose ketone index (i.e. low to moderate ketosis) may be an effective tool for preventing many common metabolic diseases such as type 2 diabetes. Additionally, it may actually be very beneficial to periodically (once or twice per year) employ a metabolic therapy (such as an extended fasting period) that pushes our index into the 1.0-3.0 range as an effective technique for disease prevention.

3. Athletic performance
By measuring the glucose ketone index and correlating with diet, training regimen and performance, athletes may be able to identify their own personal zones of optimal performance.

4. Weight loss
For those using metabolic therapy to lose weight, the glucose ketone index may actually be a more effective marker than tracking glucose and ketones independently. Heads Up Health can help to track and correlate the index along with other metrics such as weight and body fat.

5. Fasting
Tracking the glucose ketone index can be a very helpful piece of biofeedback to understand how your metabolism is responding during the fasting period. Over time, you can look back at different fasting periods and use the index as an indicator of your metabolic state during the course of the fasting period.

6. Feeling awesome
If you are employing fasting and/or ketogenic diets for optimal health, the glucose ketone index can help you find your ideal sweet spot. If you reach a point where you start feeling absolutely awesome (which you inevitably will in ketosis), take a glucose and ketone reading and calculate your index. Having data to know when you are feeling your best will increase your chances of being able to consistently reproduce this state of optimal performance.

Here is a infographic created by one of our beloved Heads Up users, Michael Alward, based on Optimal Ketogenic Living’s Raymund Edwards’ work with Dr. Thomas Seyfried:

Glucose Ketones Index

Glucose Ketones Index

Tracking the Glucose Ketone Index in Heads Up Health

In order to track the glucose ketone index, you will need to measure glucose and ketones at the same time. This means two drops of blood – one for glucose and one for ketones.

Create a new Glucose Ketone Index reading by entering both numbers into your Heads Up profile. For those who measure blood glucose in mg/dL, Heads Up Health will convert this number into mmol/L as part of the calculation.

Track the glucose ketone index in your Heads Up Health profile

Track the glucose ketone index in your Heads Up Health profile

Once you have stored your first readings, you can track the index on your dashboard along with all of your other health metrics:

Tracking the glucose index on your Heads Up dashboard

Tracking the glucose index on your Heads Up dashboard

Lastly, you can trend the index on the Analyzer and compare it to your other health metrics:

Trend your glucose ketone index over time and compare it to other health metrics.

Trend your glucose ketone index over time and compare it to other health metrics.

The following video shows exactly how to enter and track the index in your Heads Up profile:


If you are already tracking glucose and/or ketones or leveraging metabolic therapies such as fasting and ketogenic diets, the index can be helpful metric to track your progress. Heads Up Health can help you track this marker and compare it to your other health metrics. You can create your free account and start tracking this index today.


References and additional information:

[1] The glucose ketone index calculator: a simple tool to monitor therapeutic efficacy for metabolic management of brain cancer

[2] Raymund Edwards – Optimal Ketogenic Living

[3] The Quantified Body – Water Fasts as a Potential Tactic to Beat Cancer

[4] Thomas Seyfried, PhD — Cancer as a Mitochondrial Metabolic Disease

[5] Boston College and Heads Up Health Partner to Help Patients Monitor Metabolic Health

About the Author

Dave Korsunsky is a technologist and health tracking enthusiast. He is also the founder and CEO of Heads Up Health.
12 Responses to "Tracking the Glucose Ketone Index"
  1. Alessandro Ferretti says:

    Hi David,
    Just wanted to specify that the information stated regarding the GKI are from a gentleman named Raymond Edwards. He has a collective information site called OKL (Optimal Ketogenic Living). I have referenced him in my lecture slides and verbally and I wouldn’t want to take credit for work that Raymond has carried out.

  2. Bob Lawrence says:

    Dave, love the work you have done. I have lost 60 lb in 4 months and use your site every day! Thank you for the huge amount of work you have done. I am 65 and for the first time in my life I am in control and aware of my metabolism! I do have a question : if I am entering glucose and ketones into your system, why the calculation for Glucose: Ketone Index is not automatically done and entered?

  3. Kathryn says:

    I agree with Bob. If glucose is entered with filters and ketones are entered with filters then GKI should automatically calculate. In the video, when the glucose was corrected on the GKI calc, it did not show the additional extra steps of having to re-enter the glucose to also correct the reading there. Seems like a lot of extra steps, although I love the graphing capabilities.

  4. Rachael Sotos says:

    I believe that Seyfried says that therapeutic ketosis is less than one; nutritional ketosis is less than 2. Your use of terminology is possibly incorrect and you are also possibly giving incorrect information. Because this is such a vital issue, you should be more careful, in my opinion.

    • Hi Rachel. We took the reference ranges from another source, which we have cited. That said, we will double check with Dr. Seyfried and update the ranges if necessary. We are fully aware of the implications of our work. Thanks for your concern.

  5. Marilynn says:

    This is really making my head spin. My mother was a diabetic and I would test her blood with a meter and if it was in the range the doctor advised it was all good. It was hard to get her blood sugar down. Also she took medicine for diabetes. I did put her on a low carb diet and it would cause it to go to low. Was this because she was taking the medicine? My comment is wouldn’t the glucose meter be stuff? I am familiar with it’s use.

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